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FIWARE.ArchitectureDescription.Cloud.IaaS - FIWARE Forge Wiki

FIWARE.ArchitectureDescription.Cloud.IaaS

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Contents

Copyright

Copyright © 2011-2015 by IBM and Intel Corporations

Legal notice

Please check the following Legal Notice to understand the rights to use these specifications.

Overview

This specification describes the IaaS GE (renamed from IaaS Resource Management GE), which is a key enabler to build a cloud solution.

The IaaS GE provides the basic Virtual Machine (VM) hosting capabilities, as well as management of the corresponding resources within the Data Center that hosts a particular FIWARE Cloud Instance.

The current release of IaaS GE comprises the core services of OpenStack Kilo Release, as follows:

The main capabilities provided for a cloud hosting user are:

  • Browse VM template catalogue and provision a VM with a specified virtual machine image
  • Manage life cycle of the provisioned VM
  • Manage network and storage of the VM
  • Resource monitoring of the VM
  • Resiliency of the persistent data associated with the VM
  • Manage resource allocation
  • Secure access to the VM

For a cloud hosting provider, the following capabilities are provided:

  • Policy-based resource allocation and optimization
  • Multi-tenancy (support isolation between VMs of different accounts)
  • Automation of typical admin tasks (aimed at decreasing the admin cost)
  • Resiliency of the infrastructure and of the management stack (aimed at reducing outage due to hardware failures)

Basic Concepts

The key concepts visible to the cloud user are:

  • Virtual server, a virtualized container that can host an arbitrary Operating System and arbitrary software stack on top, installed within the virtual server. Virtual servers are also referred as Virtual Machines (VMs) or (virtual) image instances (see definition of virtual image below). The IaaS GE supports provisioning and life cycle management of Virtual Servers.
  • Virtual disk, representing a persistent virtual disk that can be potentially attached to an arbitrary virtual server. The IaaS GE supports provisioning of virtual disks, as well as their attachment to virtual servers.
  • Virtual network, representing a logical network abstraction that would typically represent a network segment at layer 2 of the OSI model. The IaaS GE supports provisioning of virtual networks, as well as attachment of virtual NICs of virtual servers to them.
  • Computing Flavor, a computing flavor is a hardware configuration that can be associated with a virtual server. Each flavor has a unique combination of CPU cores, memory capacity and disk space. An example of this combination could be 8 virtual CPUs, 16 Gb RAM, 10 Gb HDD and 160 Gb of ephemeral disk (a disk that is stored locally on the hypervisor host and is not persistant). Computing flavors must be registered and made available prior to their association to virtual servers.
  • Virtual image, an image is a collection of packaged files used to create or rebuild a virtual server. Basically, a virtual image is a snapshot of a virtual server from which you can create new virtual servers (i.e., image instances). Each virtual server derived from a virtual image hosts the Operating System and software stack associated with the virtual image and is assigned one among the set of available computing flavors, each of which maps to a configuration of computing resources (memory, CPU, etc.). A number of pre-built virtual images can be made available to cloud users but they may also create their own images using tools defined for that purpose. These custom images are useful for backup purposes or for producing "gold" server images if you plan to deploy a particular server configuration frequently. The IaaS GE supports life cycle of virtual images, as well as provisioning of virtual servers based on virtual images.

Main Interactions

IaaS GE provides a wide variety of operations to provision and manage the life cycle of cloud resources. The most important ones are listed below.

Virtual Images

  • listVirtualImages -- Returns a list of all available virtual images (visible by the authenticated user)
  • queryVirtualImages -- Returns a list of available virtual images, filtered by given query criteria
  • getVirtualImageDetails -- Returns details of a virtual image (type, size, creation details, etc.)
  • uploadVirtualImage -- Uploads a new virtual image into the virtual image repository

Virtual Servers

Provisioning

  • createVirtualServer -- Provisions a new virtual server with the given properties (virtual hardware, policy parameters, access, etc). Returns unique ID of the virtual server.
  • destroyVirtualServer -- Removes a virtual server

Power Management

  • powerOnVirtualServer -- Powers on a virtual server
  • powerOffVirtualServer -- Powers off a virtual server
  • RestartVirtualServer -- Restarts a virtual server
  • ShutdownVirtualServer -- Shuts down a virtual server (note: the ability to perform this operation on the fly depends on the capabilities of the underlying virtualization platform)

Reconfiguration

  • resizeVirtualServer -- Changes the virtual hardware allocation for a virtual server, e.g., allocated RAM or number of CPUs (note: the types of resources for which the reconfiguration can be done on the fly depends on the capabilities of the underlying virtualization platform)

Inventory

  • getVirtualServerDetails -- Returns details of a virtual server (virtual hardware specification, state, associated policy parameters, access details, etc.)

Virtual Disks

Provisioning

  • createVirtualDisk -- Provisions a new virtual disk with the given properties (size, capabilities, etc.). Returns unique ID of the virtual disk.
  • destroyVirtualDisk -- Removes a virtual disk

Attachment

  • attachVirtualDisk -- Attaches a given virtual disk to a given virtual server (note: the ability to perform this operation on the fly depends on the capabilities of the underlying virtualization platform)
  • detachVirtualDisk -- Detaches a given virtual disk from a given virtual server (note: the ability to perform this operation on the fly depends on the capabilities of the underlying virtualization platform)

Inventory

  • getVirtualDiskDetails -- Returns details of a given virtual disk (size, capabilities, attachment details, etc.)

Virtual Networks

Provisioning

  • createVirtualNetwork -- Provisions a new virtual network with the given properties (e.g., VLAN ID, capabilities, etc.). Returns unique ID of the virtual network.
  • destroyVirtualNetwork -- Removes a virtual network

Attachment

  • attachVirtualServerToNetwork -- Attaches a virtual network interface of a given virtual server to a given virtual network
  • detachVirtualServerFromNetwork -- Detaches a virtual network interface of a given virtual server from a given virtual network

Inventory

  • getVirtualNetworkDetails -- Returns details of a given virtual network (ID, capabilities, attachment details, etc.)

Basic Design Principles

When applied to IaaS GE, the general design principles outlined at Cloud Hosting Architecture can be translated into the following key design goals:

  • Fully-automated provisioning and life cycle of compute, storage and network resources, requested, managed and released via a standards-based REST API: The REST API allows management of the provisioned resources both through a Web-based user interface or direct API invocation. The API is designed to be abstract and "declarative": a tenant specifies "what" he needs, while the "how" of the provisioning is left to the infrastructural policies and goals. The goal is to provide a standard interface to consume the virtual resource service regardless of the underlying technology used to implement the provisioning infrastructure.
  • High resource utilization, while providing the necessary levels of isolation, availability and performance of provisioned resources: Improved utilization and automation of resources allow greater cost efficiencies for both infrastructure providers and tenants.
  • Ability to dynamically control the amount of allocated resources, as well as to monitor the actual resource usage: Dynamic control of resource provisioning is at the core of application elasticity, enabling the correct sizing of applications' components and operating costs to the varying load conditions.
  • High availability and scalability of the management stack: The infrastructure management components provide availability and scalability through the most advanced current design and development practices, including: fully-distributed shared-nothing architectures to naturally support horizontal scalability, asynchronous communication mechanisms, and extensive automated testing cycles for each contribution.
  • Non-disruptive, automated administrative tasks (e.g., infrastructure maintenance): when scale grows, partial hardware and software failures are the norm rather than the exception. Infrastructure providers require mechanisms to automate administrative tasks reducing the needed effort and preventing any disruption to the tenants' services and applications.
  • Avoid non-authorized access to resources and workloads: Role Based Access Control (RBAC), coupled with an Identity Management service, ensure security by user, role and project.
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